The official OS X 10.10.2 Beta 1 (14C68k) release notes includes; Fixation of bugs, Wi-Fi improvement and error fixes, performance enhancement and addition of new functions. Xcode 6.2 Beta (6C86e) with WatchKit support is now available as toolset for Mac, iPhone, iPad and Apple Watch devices with OS X Yosemite and OS X Mavericks support with the inclusion of iOS 8.2 SDK and OS X 10.10 SDK.